Why doesn't Lao Yan know Jun Gao?

Lao Yan didn't know Jun Gao before, but now Jun Gao is a fake. In Unexpected Arrive, Su Wen introduced Ruan as a lawyer through Lao Yan. The plot shows that Ruan was introduced to be a lawyer through Lao Yan, but it was actually a fake. Yang Lu met, Lao Yan and Jun Gao met, and there was a hidden secret between them. After Jun Gao came to Zhou Nan to check into the hotel, he only saw Dong Fang and Lao Yan, which was a bit strange.